The All Up Weight will be the best part of two tonnes so dual axles is practically essential. I will be towing with a Nissan Terrano (Ford Maverick) which should be ok despite the long wheel base with a significant overhang behind the back wheels.
Your comments regarding the geometry are interesting although as you say a drawing would be helpful. Whilst I think I understand what you are saying, to my mind the farther rearward the pivot point the lower it will be, because of the slope of the slipway when recovering. Am I missing something?